When I clicked "Add Content" in the lefthand box in Course Manager, the righthand box displayed fields where I could enter the title, what it's required for, what it's based on, and then a word processor-like box where I can enter the content.

The problem is that there's no "submit" button, even when I scroll right to the end.

This problem didn't happen when I was adding content previously.

As a work around, I clicked "show only this frame", and then I was able to see a "submit" button below the box where I could enter content.